You should be able to access the datasets in the Resources section of the individual Task pages.
Task 1 + Task 2 : AIcrowd | Meta KDD Cup 24 - CRAG - Retrieval Summarization | Challenges
Task 2: MockAPI
Task 3: AIcrowd | Meta KDD Cup 24 - CRAG - End-to-End Retrieval-Augmented Generation | Challenges
Best of Luck